Analysis of Displacement Monitoring Measurement in Tunnel Construction

2013 ◽  
Vol 658 ◽  
pp. 635-638
Author(s):  
Yang Liu ◽  
Jie Hu
Keyword(s):  
Theoretical Basis ◽  
Soil Mass ◽  
Measured Data ◽  
Time Effect ◽  
Rock Deformation ◽  
Tunnel Construction ◽  
Displacement Monitoring ◽  
Mathematical Methods ◽  
Tunneling Method ◽  
Regressing Analysis

Based on measured data of Wuxinzhai tunnel in expressway of Shanyin to Pinglu, mathematical methods were used to make regressing analysis of measured date on crown settlement and periphery convergence. According to the time-effect of soil mass excavation in New Austrian Tunneling Method, the relations between rock deformation and time during the tunnel construction was analyzed. The results of analysis could provide an theoretical basis for modifying design and construction , and also could offer an example for similar projects in this area.

scholarly journals Thermal Performance Analysis of Heat Collection Wall in High-Rise Building Based on the Measurement of Near-Wall Microclimate

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2023
Author(s):  
Ruixin Li ◽  
Yiwan Zhao ◽  
Gaochong Lv ◽  
Weilin Li ◽  
Jiayin Zhu ◽  
...  
Keyword(s):  
Wind Speed ◽  
Structural Design ◽  
Theoretical Basis ◽  
Thermal Process ◽  
Measured Data ◽  
Passive Heating ◽  
High Rise ◽  
And Performance ◽  
Wall Components ◽  
Near Wall

Near-wall microenvironment of a building refers to parameters such as wind speed, temperature, relative humidity, solar radiation near the building’s façade, etc. The distribution of these parameters on the building façade shows a certain variation based on changes in height. As a technology of passive heating and ventilation, the effectiveness of this application on heat collection wall is significantly affected by the near-wall microclimate, which is manifested by the differences, and rules of the thermal process of the components present at different elevations. To explore the feasibility and specificity of this application of heat collection wall in high-rise buildings, this study uses three typical high-rise buildings from Zhengzhou, China, as research buildings. Periodic measurements of the near-wall microclimate during winter and summer were carried out, and the changing rules of vertical and horizontal microclimate were discussed in detail. Later, by combining these measured data with numerical method, thermal process and performance of heat collection wall based on increasing altitude were quantitatively analyzed through numerical calculations, and the optimum scheme for heat collection wall components was summarized to provide a theoretical basis for the structural design of heat-collecting wall in high-rise buildings.

The Comparison of Tunnel Engineering Construction Methods for Renhechang Tunnel Crossing Underneath Existing Tunnel on Lanzhou-Chongqing Railway

2013 ◽  
Vol 405-408 ◽  
pp. 1330-1333 ◽  
Author(s):  
Chuan Yi Sui ◽  
Xu Dong Zhou ◽  
Lin Hui Wang
Keyword(s):  
Field Measurement ◽  
Measurement Data ◽  
Tunnel Construction ◽  
Tunnel Engineering ◽  
Engineering Construction ◽  
Existing Structures ◽  
Construction Methods ◽  
Tunneling Method ◽  
Simulation Results ◽  
The Cross

Problems often exist in construction of transportation tunnels, such as the effect of new tunnels constructed close to existing structures. Solving this magnificent problem by carefully choosing tunnel construction methods will be beneficial to minimize effects on existing structures while ensuring the newly constructed tunnel is both time-consuming and economical. Three representative engineering methods-the benching tunneling method, the Center Diaphragm method and the Cross Diaphragm method-are compared in controlling the settlement of new tunnel vault and the deformation of the existing tunnel. Finally checking the simulation results by comparing with field measurement data.

Application of the Block Correction Interpolation Technology in the Ultrasonic Temperature Measurement

2011 ◽  
Vol 121-126 ◽  
pp. 1927-1931
Author(s):  
Feng Qin Xie ◽  
Hua Yu Zhang ◽  
Lin Jing Xiao ◽  
Hong Chang Ding
Keyword(s):  
Temperature Measurement ◽  
Theoretical Basis ◽  
Temperature Reconstruction ◽  
Measured Data ◽  
Gas Temperature ◽  
Gas Velocity ◽  
Analysis Software ◽  
Average Speed ◽  
Measured Field ◽  
The One

A new method about the air temperature reconstruction based on the block correction interpolation was put forward. Its theoretical basis is the principles of thermodynamics relations and ultrasonic temperature measurement. The frequency of ultrasonic generator is 40 KHz. Because of the one-to-one relationship between gas temperature and gas velocity, the gas temperature field can be reconstructed through the rebuilding of velocity field. As the distance between the generator and receiver is known, so the average speed on the path can be obtained by detecting the ultrasonic transit-time. After obtaining the average speed of many paths in the field, the correction of the measured data can be done by using the block correction interpolation technology. And through the mathematical analysis software, the reconstruction of the measured field was given.

Numerical Simulation for Construction Process Large-Span Flat Tunnel under the Condition of Shallow Buried

2014 ◽  
Vol 580-583 ◽  
pp. 1100-1104
Author(s):  
Jun Jie Li ◽  
Li Tuo ◽  
Guan Jun Zhang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Tunnel Construction ◽  
Construction Process ◽  
Large Span ◽  
Tunneling Method ◽  
Stress Changes ◽  
Flac 3D ◽  
3D Software ◽  
Grade Rock

The thesis takes a three-lane tunnel construction in Zhejiang as an example. Simulating the course of dynamic construction of large-span tunnel on geology condition of four-grade rock mass and shallow buried by FLAC 3D software ,it carries out comparative and stress situation in the runnel surrounding rocks .Getting the displacement and stress changes rule of the construction by using benching with a small pilot tunnel tunneling method can guide the construction scientifically.

The Fading Characteristic of the GSM-R Network’s Field Intensity under Raining Condition

2011 ◽  
Vol 403-408 ◽  
pp. 2740-2745
Author(s):  
Ke Sun ◽  
Xin Yu Jin ◽  
Lu Rong Jiang ◽  
Xiang Bing Zeng
Keyword(s):  
Field Intensity ◽  
Theoretical Basis ◽  
Electromagnetic Waves ◽  
Random Medium ◽  
Mie Theory ◽  
Signal Strength ◽  
Measured Data ◽  
Severe Weather ◽  
Distribution Model ◽  
Scattered Power

The signal strength of the GSM-R network’s field intensity attenuates under raining condition due to the raindrop’s absorption and scattering. Moreover, the fading characteristic is influenced greatly by the scattering effect of the rainfall. Without regard to the landform and other factors, this paper uses Mie Theory to research the receiving level’s attenuation coefficient at different rainfall rates. And the related knowledge of electromagnetic waves through random medium is used to analyze the receiving level’s fading characteristic under raining condition. Analytical results indicate that the fading distribution model of the receiving level in GSM-R network is changed, except for the strength’s attenuation. Moreover, the fading depth grows under raining condition as a result of the scattered power caused by the raindrop. The analysis in this paper is proved by the measured data along the test section of Beijing-Tianjin line, and the research results provide the theoretical basis for GSM-R network’s anti-fading measures in the severe weather.

Analysis of Diameter of the Bearing Push-Extend Reamed in the Size of the Influence of the PEMUR Pile Bearing Capacity of Single Pile

2014 ◽  
Vol 962-965 ◽  
pp. 988-991
Author(s):  
Yong Mei Qian ◽  
Da Jun Yang ◽  
Xiao Long Liu
Keyword(s):  
Finite Element Method ◽  
Shear Stress ◽  
Bearing Capacity ◽  
Theoretical Basis ◽  
Soil Mass ◽  
Single Pile ◽  
The Finite Element Method ◽  
Disc Diameter ◽  
Pile Design ◽  
Simulated Analysis

As the change of diameter of the bearing push-extend reamed in the size, failure pattern of soil mass around the PEMUR pile has changes. Based on the finite element method, simulated analysis has been conducted about normal stress and shear stress of soil around pile under different plate diameter size, which has qualitatively identified that the PEMUR pile bearing capacity of single pile has influence on disc diameter, application for this type of pile design provides a theoretical basis.

scholarly journals Numerical analysis of changing the force factors in temporary lining at the tunnel construction by the NATM

2019 ◽  
Vol 109 ◽  
pp. 00044
Author(s):  
Volodymyr Kuprii ◽  
Volodymyr Petrenko ◽  
Sofiia Kuprik ◽  
Yevhenii Kripak
Keyword(s):  
Numerical Analysis ◽  
Strain State ◽  
Tunnel Construction ◽  
Finite Element Models ◽  
Gradual Change ◽  
Bending Moments ◽  
Rock Excavation ◽  
Normal Forces ◽  
Tunneling Method ◽  
Selection For

The paper presents the results of a numerical analysis of force factors in temporary lining at the tunnel construction by New Austrian Tunneling Method (NATM). The relevance of the performed research is substantiated by the complexity of the temporary lining operation in the form of arches combination, anchors, and shotcrete that arose during construction of the Beskydskyi tunnel in Ukraine. NATM, used in construction, is associated with a change in the sectional area of the working and a staged installation of temporary lining, which leads to a gradual change in the stress-strain state of the “temporary lining – surrounding massif” system. In turn, this leads to a change in the force factors (bending moments and normal forces) in temporary lining. In this study, a series of finite-element models simulating the stages of rock excavation and installation of lining elements have been developed and analyzed. The obtained results allowed to determine the cardinal change of force factors in temporary lining, depending on the stage of construction. Changing the force factors at different stages of the tunnel construction by the NATM makes it possible to perform an optimal selection for temporary lining location.

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